This particular page is from page 71
of the November 1970 issue of American Aircraft Modeler magazine. Du-Bro Products no longer exists. All copyrights (if any) are hereby
acknowledged.

Use the U.S. Bureau of Labor Statistics' inflation calculator
to see what items cost in today's dollars. For instance, that 69¢ "Dura Collars" would be $3.85 in 2010 money.
The same exact same
Dura Collars actually sells today from Du-Bro for $4.90 - 27% more than the rate of inflation.